I'm inclined a little to agree with you, but it's not like he made his money because Gabe refused to be run by anyone. He pays his employees really well. My dad's friend still is working at Valve after going there 20 some odd years ago. He rakes in money like no ones business. But they are all benefitting from the work they have done.
Secondly, nobody knows how charitable he is in his private life. The fact that he's so private about it, inclines me to believe he's probably a decent guy, who just doesn't like the spotlight. He may be a billionaire, but how many billionaires have their employees love them like at Valve?
Lastly, most of his money is tied up in shares of the company, as he is 50%+ owner. He may use that to leverage cash loans, but he's also just smart. He doesn't really do that all that much, except when he's buying his research yachts. And those shares are only accessible by the workers, as it's a private company. Why? Because the money belongs to the laborers who produce the goods.
Now, I'm willing to change my view if there's ever a situation in which Gabe Newall is intentionally trying to avoid paying taxes, but that hasn't happened yet.
Bezos, Musk, Gates, Trump, Zuckerburg, Page, Brin, Ellison, Dell, Huang, the Waltons, Blomberg, Thiel. There's so many worse people out there. I do agree wealth is bad, but what the aforementioned are doing is significantly worse.